Concept explainers
The two masses in the Atwood’s machine shown in Figure 8-33 are initially at rest at the same height. After they are released, the large mass, m2, falls through a height h and hits the floor, and the small mass, m1, rises through a height h. (a) Find the speed of the masses just before m2 lands, giving your answer in terms of m1, m2 g, and h. Assume the ropes and pulley have negligible mass and that friction can be ignored. (b) Evaluate your answer to part (a) for the case h = 1.2m, m1 = 3.7 kg, and m3 = 4.1kg.
Want to see the full answer?
Check out a sample textbook solutionChapter 8 Solutions
Physics, Books a la Carte Plus Mastering Physics with Pearson eText -- Access Card Package (5th Edition)
Additional Science Textbook Solutions
University Physics (14th Edition)
The Cosmic Perspective (8th Edition)
Conceptual Physical Science (6th Edition)
Conceptual Physics (12th Edition)
College Physics
Tutorials in Introductory Physics
- A 4.0-kg particle moving along the x -axis is acted upon by the force whose functional form appears below. The velocity of the particle at x = 0 is v = 6.0 m/s. Find the particle’s speed at x=(a)2.0m, 2.0 (b)4.0 m. (c) 10.0m, (d) Does the particle turn around at some point and head back toward the origin? (e) Repeat part (d) if v = 2.0 m/s at x = 0.arrow_forwardAssume that the force of a bow on an arrow behaves like the spring force. In aiming the arrow, an archer pulls the bow back 50 cm and holds it in position with a force of 150 N. If the mass of the arrow is 50 g and the “spring” is massless, what is the speed of the arrow immediately after it leaves the bow?arrow_forwardRepeat the preceding problem, but including a drag force due to air of fdrag=bv .arrow_forward
- Two blocks, A and B (with mass 50.0 kg and 1.00 102 kg, respectively), are connected by a string, as shown in Figure P5.86. The pulley is frictionless and of negligible mass. The coefficient of kinetic friction between block A and the incline is k = 0.250. Determine the change in the kinetic energy of block A as it moves from to , a distance of 20.0 m up the incline (and block B drops downward a distance of 20.0 m) if the system starts from rest. Figure P5.86arrow_forwardShow that when A+B=C then A2+B2+2ABcos , where is the angle between vectors A and B .arrow_forwardTwo blocks initially at rest, each having a mass of 20 kg, are connected by a string as shown in the figure. The coefficient of sliding friction between the block and the inclined plane is 0.28. The plane is inclined at 350 with the horizontal. The blocks are accelerating at a magnitude of 0.8 m/s2. Assuming the pulleys to be light and frictionless. If the work due to force of friction at B is -105.84 J, find: d. The work done by the Tension at B. (Ans. 154.41 J) e. The work done by the Normal force at A. (Ans. 0 J) f. The work done by the Gravitation force at A. (Ans. 337.26 J) A Barrow_forward
- A cart of mass m, = 6.7 kg is on an inclined ramp (ø = 34.1 degrees). It is attached to a string of negligible mass that goes over an ideal pulley. The other end of the string is attached to another block of mass m, = 11.9 kg, as shown below. The wheels on the cart are good enough that friction between the cart and the ramp is negligible. If the blocks are given an initial speed of v, = 9.1 m/s (with m, moving down the plane), what is the common magnitude of the acceleration of the blocks? (in m/s^2)arrow_forwardThe juggling skateboarder is back outside He starts with a speed of of 3.0 m/s at a height ten meters above lake level, and then rolls down. Assuming that the effects of friction were negligible, how fast should he be moving when he is just two meters above lake level?arrow_forwardIf the skier coasts up the hill, what is his speed (in m/s) when he reaches the top plateau? Assume friction between the snow and skis is negligible.arrow_forward
- A simple pendulum consists of a 2.0 kg bob attached to a light string 3.0 m in length. While hanging at rest with the string vertical, the bob is struck sharply giving it a horizontal speed of 4.5 m/s. When the string makes an angle of 30 with the vertical find a) its speed and the tension in the string. b) What is the angle of the string with the vertical when it reaches its highest point?arrow_forwardA bead is sliding frictionlessly in the orbit in the Figure. (a) If the bead is released from the height h = 3.5R, what is its speed in A? (b) If its mass is 5 g, what is the magnitude of the perpendicular force acting on it at this point?arrow_forwardA crate is pushed up a frictionless inclined plane with initial speed of 4 m/s. The angle of incline is 30 degrees. (a) What is its speed when it gets back to the bottom? (b) How far up the plane does the block go? (c) How long does it take to get there?arrow_forward
- University Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice UniversityClassical Dynamics of Particles and SystemsPhysicsISBN:9780534408961Author:Stephen T. Thornton, Jerry B. MarionPublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning